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  • Understanding Server-Sent Events in HTML5
    Understanding Server-Sent Events in HTML5
    Server-SentEvents (SSE) is a technology in HTML5 that implements server pushing data to clients in real time, and is suitable for stock market, notification systems and other scenarios. It is based on the HTTP protocol, and remains open after establishing a connection. The server can send updates at any time, supporting automatic reconnection and standard data formats. The front-end receives data by creating an EventSource object and listening to message events. The backend needs to set the correct MIME type (text/event-stream) and keep the connection open and continuously output data stream. When using it, you need to pay attention to cross-domain issues, connection timeouts, browser compatibility and intermediate layer restrictions.
    HTML Tutorial . Web Front-end 532 2025-07-23 01:21:42
  • HTML `script` Tag Placement Best Practices
    HTML `script` Tag Placement Best Practices
    The placement of tags affects the performance of the page. There are four main points: 1. Putting scripts is suitable for initializing content, but will block rendering. It is recommended to use defer or async; 2. Putting scripts at the end is the most secure, rendering the content first and then executing the script, which is conducive to user experience; 3. Defer and async are used to optimize loading, defer is executed in order, and async is executed independently; 4. Inline scripts should be as small as possible, external scripts are recommended to load asynchronously, and modular scripts are asynchronous by default. Reasonably select locations and attributes to balance functions and performance.
    HTML Tutorial . Web Front-end 699 2025-07-23 01:12:02
  • HTML `datalist` for Autocomplete Suggestions
    HTML `datalist` for Autocomplete Suggestions
    How to use HTML native tags to achieve automatic completion of input boxes? 1. Use and association, bind id through list attributes; 2. Add multiple options to datalist as suggestions; 3. Options can be generated dynamically through JavaScript to achieve dynamic loading; 4. Pay attention to the compatibility and style limitations of different browsers, and use JS to implement them yourself when interaction requirements are high.
    HTML Tutorial . Web Front-end 398 2025-07-23 01:06:33
  • HTML `kbd` Tag for Keyboard Input
    HTML `kbd` Tag for Keyboard Input
    Tags are used to represent what users enter through the keyboard, improving semantics and accessibility. First of all, it clearly informs the browser and screen reader that the content is keyboard input, which helps visually impaired users understand; secondly, the default style comes with a "code style", which allows visual distinction without additional CSS; it is simple to use, just wrap the key text in a tag, such as Ctrl C; it can also be nested with tags and other tags to enhance the clarity of the content structure; unlike the representation code snippet or semantic container, it is dedicated to keyboard input; pay attention to avoid abuse of mouse operations, custom styles and are supported by mainstream browsers.
    HTML Tutorial . Web Front-end 312 2025-07-23 01:05:11
  • Implementing Dropdown Menus with HTML `select`
    Implementing Dropdown Menus with HTML `select`
    Dropdown menus are common in web design, and elements of HTML are the standard way to create them. 1. Use tags to wrap multiple elements to create basic drop-down menus; 2. Use selected attributes to set default options; 3. Use tags to group options to improve readability; 4. Use CSS to customize basic styles, but the consistency across browsers is limited; 5. Use JavaScript to listen to change events and realize dynamic interactions when options change, such as changing background color or submitting form data. This method is simple, easy to use and has basic interactive features, suitable for most website needs.
    HTML Tutorial . Web Front-end 415 2025-07-23 00:58:21
  • HTML `map` and `area` for Image Hotspots
    HTML `map` and `area` for Image Hotspots
    Tomakedifferentpartsofanimageclickablewithoutslicingit,useHTML'smapandareatags.Themaptagcontainsareaelementsthatdefineclickableregionsonanimage.Eachareaspecifiesashape(rect,circle,poly)andcoordinatestomapthehotspot.Forexample,arectangleusescoords=&qu
    HTML Tutorial . Web Front-end 752 2025-07-23 00:55:41
  • HTML5 Forms Validation Techniques
    HTML5 Forms Validation Techniques
    Form verification can be implemented with built-in HTML5 properties including required, min, max, pattern and type to ensure that users enter the correct data; for example, use a verifiable mailbox format. The setCustomValidity() method of JavaScript can be customized, such as listening to input events and setting prompt information. At the same time, you can add style feedback for valid or invalid inputs by CSS pseudo-classes:valid and:invalid, such as red and green borders to distinguish between errors and correct inputs.
    HTML Tutorial . Web Front-end 457 2025-07-23 00:39:02
  • HTML `textarea` for Multi-Line Text Input
    HTML `textarea` for Multi-Line Text Input
    Tags are used to let users enter multiple lines of text. 1. The basic writing method includes name, id, cols and rows attributes, and the default text can be set in the tag; 2. Optimizing the user experience can be achieved by automatically adjusting the height, setting maxlength, adding placeholder, disabling resize, etc.; 3. Notes include line break character processing, special character escape, mobile input experience, and default content clearing issues. Rational use can improve the interactive quality of form and is suitable for comments, comments and other scenarios.
    HTML Tutorial . Web Front-end 301 2025-07-23 00:34:41
  • HTML `blockquote` for Block Quotations
    HTML `blockquote` for Block Quotations
    Use is standard because it has clear semantics and can improve accessibility and SEO. The benefits include: 1. Clear semantics and clearly identifying the citation content; 2. The default is indented style, which visually distinguishes citations; 3. It is convenient for unified style control, and the appearance can be customized through CSS. The basic structure is the content of the package reference and can be nested, etc. to enhance the structure and source description. Beautification methods include adding borders, background colors, font styles and inserting quotes using pseudo-elements to improve the aesthetics of the page and user experience.
    HTML Tutorial . Web Front-end 904 2025-07-23 00:33:11
  • Figures and Captions with HTML `figure` and `figcaption`
    Figures and Captions with HTML `figure` and `figcaption`
    and are semantic tags in HTML that are used to associate media content with their explanatory text. 1. Used to wrap independent content blocks, such as pictures, charts or videos; 2. As its child elements, it is used to add explanatory text and can be placed before and after the content; 3. Using these two tags can improve semantic structure, enhance barrier-free access, facilitate style control and responsive design; 4. It is recommended to place it at the bottom, each containing only one main content, and add spacing and text styles through CSS; 5. They are not only suitable for pictures, but also for code blocks, charts, videos and other scenarios.
    HTML Tutorial . Web Front-end 347 2025-07-23 00:22:31
  • HTML Standard Validation Tools and Techniques
    HTML Standard Validation Tools and Techniques
    To ensure that the HTML code complies with the standards can be achieved in four ways: 1. Use online verification tools such as W3CMarkupValidationService to quickly check for errors and prompt HTTPS support; 2. Install HTML verification plug-in in the IDE to achieve real-time feedback and custom rules; 3. Use command line tools html-validate or tidy for automated batch verification and integrate with CI/CD; 4. Pay attention to hidden problems such as case mixing, label not closed, etc., and maintain good coding habits to improve compatibility and SEO performance.
    HTML Tutorial . Web Front-end 549 2025-07-23 00:21:23
  • HTML `viewport` Meta Tag for Responsive Design
    HTML `viewport` Meta Tag for Responsive Design
    The viewportmeta tag is the basis for mobile adaptation, and its core function is to control the display of web pages on mobile devices. 1. It sets width=device-width to match the actual width of the device; 2. Initial-scale=1 ensures that the initial scaling ratio of the page is 1, avoiding the browser's automatic scaling resulting in too small text or misplaced layout; 3. If viewport is not set, responsive layout failure, media query cannot take effect, and inaccurate click areas may occur; 4. It is recommended to keep it simple and set basic parameters only to avoid restricting user scaling to improve accessibility; 5. At the same time, media query, relative units, picture adaptation and other means can be combined to achieve the completion.
    HTML Tutorial . Web Front-end 723 2025-07-23 00:19:03
  • Using HTML `small` Tag for Smaller Text
    Using HTML `small` Tag for Smaller Text
    Tags are used to define semantic small texts and are suitable for secondary content such as copyright information and disclaimers. 1. It is an inline element, with a default font size of 80%; 2. It has more semantic advantages than CSS and improves accessibility; 3. It can flexibly control styles such as color, font size, etc.; 4. Pay attention to avoid multi-layer nesting, abuse of style tools, and ensure that the mobile terminal readability is not less than 12px.
    HTML Tutorial . Web Front-end 669 2025-07-23 00:18:22
  • HTML `button` `formaction` and `formenctype` Attributes
    HTML `button` `formaction` and `formenctype` Attributes
    Formaction and formctype are two practical properties of tags in HTML. 1. Formaaction is used to specify the address of the button submission, overriding the action of the form itself, such as in the example, one button is submitted to /default-action and the other is submitted to /special-action; 2. Formenctype is used to set the encoding type of form data, such as using multipart/form-data to support file upload, its value can be application/x-www-form-urlencoded, multipart/form-data or text/plain;
    HTML Tutorial . Web Front-end 157 2025-07-23 00:17:42

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